(Freplace_match): Give error if

NEWTEXT uses backslash in an invalid way.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/search.c b/src/search.c
index abdd2460bd8..9978f9b7e3b 100644
--- a/src/search.c
+++ b/src/search.c
@@ -1821,7 +1821,8 @@ since only regular expressions have distinguished subexpressions.")
                            make_number (search_regs.start[sub]));
       after = Fsubstring (string, make_number (search_regs.end[sub]), Qnil);
 
-      /* Do case substitution into NEWTEXT if desired.  */
+      /* Substitute parts of the match into NEWTEXT
+         if desired.  */
       if (NILP (literal))
         {
           int lastpos = -1;
@@ -1856,6 +1857,8 @@ since only regular expressions have distinguished subexpressions.")
                     }
                   else if (c == '\\')
                     delbackslash = 1;
+                  else
+                    error ("Invalid use of `\\' in replacement text");
                 }
               if (substart >= 0)
                 {
@@ -1888,6 +1891,7 @@ since only regular expressions have distinguished subexpressions.")
           newtext = concat2 (accum, middle);
         }
 
+      /* Do case substitution in NEWTEXT if desired.  */
       if (case_action == all_caps)
         newtext = Fupcase (newtext);
       else if (case_action == cap_initial)
@@ -1929,8 +1933,10 @@ since only regular expressions have distinguished subexpressions.")
                        make_number (search_regs.start[c - '0'] + offset),
                        make_number (search_regs.end[c - '0'] + offset));
                 }
-              else
+              else if (c == '\\')
                 insert_char (c);
+              else
+                error ("Invalid use of `\\' in replacement text");
             }
           else
             insert_char (c);